One enthusiast has walked hundreds of miles to count butterflies; another has devoted his time and his greenhouse to growing one rare butterfly; a third is fanatical about moths and has learned to identify all 2,500 British species; and one has been getting his hands dirty to restore a chalk down and its butterfly star to their former glory.
The programme reveals the highs and lows of British butterflies and moths and gives a window onto the lives of four of the passionate people that are fighting to save them.
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